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This paper shows that educational outcomes for both types of children in blended families -- stepchildren and their half-siblings who are the joint biological children of both parents -- are similar to each other and substantially worse than outcomes for children reared in traditional nuclear families. We conclude that, as a description of the data, the crucial distinction is between children reared in traditional nuclear families (i.e., families in which all children are the joint biological children of both parents) and children reared in other family structure (e.g., single-parent families or blended families).

The paper's second contribution is to clarify the question, "What is the effect of family structure on outcomes for children?" Interpreted literally, the question asks about the effect of one endogenous variable on another. We argue for reformulating the family structure question by specifying some explicit counterfactual, and express a preference for a policy-relevant counterfactual. As an example, we suggest considering the effect of reducing the "marriage penalty" in the earned-income tax credit (EITC) that makes the credit essentially unavailable to two-earner couples. The EITC marriage penalty counterfactual, like any policy-relevant counterfactual, focuses attention on outcomes for those children whose parent's behavior is affected by the incentives created by the policy change.